I'm starting with front pieces. I laid out the central and the side panels as displayed on the picture: the hem lines are aligned and the panels are positioned as close to each other as possible. I fixed the panels together along the vertical lines using a cello tape. I drew a horizontal line on the side panel, positioning it where I wanted to draft a pocket. Then I curved one side of the line, using a round coaster.

You can note that the central and side panels aren't aligned well at the top of the pocket - there is a small vertical dart separating the pieces. So I had to make a minor alteration. I drew a horizontal line on the side panel, positioning it at the apex of the vertical dart.

I cut the side panel along the horizontal line and I rotated the top of the pocket towards the central panel, thus closing the vertical dart. This caused forming another, horizontal dart on the side panel. I closed the horizontal dart with a piece of paper. Then I altered a bit the pocket line - I lowered the lateral side of the pocket by 1cm (by the width of the previously closed horizontal dart). You can see on the picture both the original and altered pocket line. Then I cut off the extra height of the pocket.

Now it's time to alter the top parts of the pattern. I laid out the central and the side panels as displayed on the picture: shoulder lines are aligned and panels are positioned as close to each other as possible. Again, I fixed the pieces together using the cello tape. I repeated the previously described steps: I drew a horizontal line over the bust, curved one side of the line and cut the central panel along the curve.

The central and the side panels form a dart at some point, so I made another alteration to close the dart. I drew a horizontal line on the central panel, where the dart apex is positioned. I sliced the central piece along the horizontal line and I rotated the lower cutout towards the side panel thus closing the dart. I closed the horizontal dart using a piece of paper.

Then I altered the curve: I shifted up the point by 2.5cm (by the width of the horizontal dart). You can see the original curve and the altered one. Later I cut the extra length from the central piece.

This is how the pattern pieces look like after all these alterations. The straight grain line matches with the side panel on the top piece, while the straight grain line matches with the central panel on the bottom piece.